8 welding symbols
TRANSCRIPT
Welding InspectorWelding Inspector
Welding SymbolsWelding Symbols
Section 8Section 8
Advantages of symbolic representation:Advantages of symbolic representation:
simple and quick plotting on the drawingsimple and quick plotting on the drawing
does not over-burden the drawingdoes not over-burden the drawing
no need for additional viewno need for additional view
gives all necessary indications regarding the specific joint to gives all necessary indications regarding the specific joint to be obtainedbe obtained
Disadvantages of symbolic representation:Disadvantages of symbolic representation:
used only for usual jointsused only for usual joints
requires training for properly understanding of symbolsrequires training for properly understanding of symbols
Weld symbols on drawingsWeld symbols on drawings
The symbolic representation includes: The symbolic representation includes:
an arrow linean arrow line
a reference linea reference line
an elementary symbol an elementary symbol
The elementary symbol may be completed by:The elementary symbol may be completed by:
a supplementary symbola supplementary symbol
a means of showing dimensionsa means of showing dimensions
some complementary indicationssome complementary indications
Weld symbols on drawingsWeld symbols on drawings
In most standards the cross sectional dimensions are given to In most standards the cross sectional dimensions are given to the left side of the symbol, and all linear dimensions are give on the left side of the symbol, and all linear dimensions are give on the right sidethe right side
DimensionsDimensionsConvention of dimensions Convention of dimensions
a = Design throat thicknesss = Depth of Penetration, Throat thicknessz = Leg length (min material thickness)
BS EN ISO 22553BS EN ISO 22553
AWS A2.4AWS A2.4•In a fillet weld, the size of the weld is the leg length•In a butt weld, the size of the weld is based on the depth of the joint preparation
A method of transferring information from the A method of transferring information from the design office to the workshop is:design office to the workshop is:
The above information does not tell us much about the wishes The above information does not tell us much about the wishes of the designer. We obviously need some sort of code which of the designer. We obviously need some sort of code which would be understood by everyone.would be understood by everyone.
Most countries have their own standards for symbols. Most countries have their own standards for symbols. Some of them are AWS A2.4 & BS EN 22553 (ISO 2553)Some of them are AWS A2.4 & BS EN 22553 (ISO 2553)
Please weld Please weld here here
Weld symbols on drawingsWeld symbols on drawings
Joints in drawings may be indicated:Joints in drawings may be indicated:
•by detailed sketches, showing every dimensionby detailed sketches, showing every dimension
•by symbolic representationby symbolic representation
Weld symbols on drawings
Elementary Welding SymbolsElementary Welding Symbols(BS EN ISO 22553 & AWS A2.4)(BS EN ISO 22553 & AWS A2.4)
Convention of the elementary symbols: Convention of the elementary symbols:
Various categories of joints are characterised by an elementary symbol.
The vertical line in the symbols for a fillet weld, single/double bevel butts and a J-butt welds must always be on the left side.
Square edgeSquare edgebutt weldbutt weld
Weld typeWeld type SketchSketch SymbolSymbol
Single-vSingle-vbutt weldbutt weld
Elementary Welding SymbolsElementary Welding Symbols
Single-V butt weld Single-V butt weld with broad root facewith broad root face
Weld typeWeld type SketchSketch SymbolSymbol
Single bevel Single bevel butt weldbutt weld
Single bevel butt Single bevel butt weld with broad weld with broad
root faceroot face
Backing runBacking run
Elementary Welding SymbolsElementary Welding Symbols
Single-USingle-U
butt weld butt weld
Weld typeWeld type SketchSketch SymbolSymbol
Single-JSingle-J
butt weldbutt weld
Fillet weldFillet weld
SurfacingSurfacing
Plug weld
Resistance spot weld
Resistance seam weld
Square Butt weld
Steep flanked Single-V Butt
Surfacing
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
Arrow LineArrow Line
(BS EN ISO 22553 & AWS A2.4):(BS EN ISO 22553 & AWS A2.4):
Convention of the arrow line:Convention of the arrow line:
• ShallShall touch the joint intersection touch the joint intersection
• ShallShall not be parallel to the drawing not be parallel to the drawing
• ShallShall point towards a single plate preparation (when only point towards a single plate preparation (when only one plate has preparation)one plate has preparation)
(AWS A2.4)(AWS A2.4)
Convention of the reference line: Convention of the reference line:
ShallShall touch the arrow line touch the arrow line
ShallShall be parallel to the bottom of the drawing be parallel to the bottom of the drawing
Reference LineReference Line
oror
Reference LineReference Line
(BS EN ISO 22553)(BS EN ISO 22553)
Convention of the reference line: Convention of the reference line:
• ShallShall touch the arrow line touch the arrow line
• ShallShall be parallel to the bottom of the drawing be parallel to the bottom of the drawing
• There shallThere shall be a further broken identification line above or be a further broken identification line above or beneath the reference line (Not necessary where the weld beneath the reference line (Not necessary where the weld is symmetrical!)is symmetrical!)
(BS EN ISO 22553 & AWS A2.4)(BS EN ISO 22553 & AWS A2.4)
Convention of the double side weld symbols:Convention of the double side weld symbols:
Representation of welds done from Representation of welds done from both sidesboth sides of the joint of the joint intersection, touched by the arrow headintersection, touched by the arrow head
Fillet weldFillet weld
Double VDouble V
Double bevelDouble bevel
Double UDouble U
Double JDouble J
Double side weld symbolsDouble side weld symbols
Arrow lineArrow line
Reference linesReference lines
Arrow sideArrow side
Other sideOther side Arrow sideArrow side
Other sideOther side
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
Single-V Butt flush capSingle-V Butt flush cap Single-U Butt with sealing runSingle-U Butt with sealing run
Single-V Butt with Single-V Butt with permanent backing strippermanent backing strip
M M
Single-U Butt with Single-U Butt with removable backing stripremovable backing strip
M RM R
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
Single-bevel buttSingle-bevel butt Double-bevel buttDouble-bevel butt
Single-bevel butt Single-bevel butt Single-J buttSingle-J butt
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
Partial penetration single-V buttPartial penetration single-V butt‘‘S’ indicates the depth of penetrationS’ indicates the depth of penetration
s10s10
10101515
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
aa = Design throat thickness= Design throat thicknessss = Depth of Penetration, Throat = Depth of Penetration, Throat thicknessthicknessz z = Leg length(min material thickness)= Leg length(min material thickness)a a = (0.7 x z)= (0.7 x z)
a 4a 4
4mm Design throat 4mm Design throat
z 6z 6
6mm leg6mm leg
az s
s 6s 6
6mm Actual throat 6mm Actual throat
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
Arrow sideArrow side
Arrow sideArrow side
Other sideOther side
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
Other sideOther side
s6
s6
6mm fillet weld
n n = number of weld elements= number of weld elementsl l = length of each weld element= length of each weld element((ee)) = distance between each weld element= distance between each weld element
nn x x l l ( (ee))
Welds to be Welds to be staggeredstaggered
ProcessProcess
2 x 402 x 40 (50) (50)
3 x 403 x 40 (50) (50)111111
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
80 80 80
909090
6
6
5
5
z5z5
z6z6
3 x 80 (90)3 x 80 (90)
3 x 80 (90)3 x 80 (90)
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
All dimensions in mmAll dimensions in mm
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
All dimensions in mmAll dimensions in mm
8
8
6
680 80 80
909090
z8z8
z6z6
3 x 80 (90)3 x 80 (90)
3 x 80 (90)3 x 80 (90)
Supplementary symbolsSupplementary symbols
Concave or ConvexConcave or Convex
Toes to be ground smoothly Toes to be ground smoothly (BS EN only)(BS EN only)
Site WeldSite Weld
Weld all roundWeld all round
(BS EN ISO 22553 & AWS A2.4)(BS EN ISO 22553 & AWS A2.4)
Convention of supplementary symbolsConvention of supplementary symbols
Supplementary information Supplementary information such as welding process, weld profile, NDT and any special instructions
Supplementary symbolsSupplementary symbols
Further supplementary information, such as WPS number, or Further supplementary information, such as WPS number, or NDT may be placed in the fish tailNDT may be placed in the fish tail
Ground flushGround flush
111111
Welding process Welding process numerical BS EN numerical BS EN
MRMR
Removable Removable backing strip backing strip
Permanent Permanent backing strip backing strip
MM
(BS EN ISO 22553 & AWS A2.4)(BS EN ISO 22553 & AWS A2.4)
Convention of supplementary symbolsConvention of supplementary symbols
Supplementary information Supplementary information such as welding process, weld profile, NDT and any special instructions
bbaa
ddcc
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
ConvexConvexMitreMitre
Toes Toes shall be shall be blendedblended
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
ConcaveConcave
aa = Design throat thickness= Design throat thicknessss = Depth of Penetration, Throat = Depth of Penetration, Throat thicknessthicknessz z = Leg length(min material thickness)= Leg length(min material thickness)a a = (0.7 x z)= (0.7 x z)
a 4a 4
4mm Design throat 4mm Design throat
z 6z 6
6mm leg6mm leg
az s
s 6s 6
6mm Actual throat 6mm Actual throat
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
Field weld (site weld)Field weld (site weld)
The component requires The component requires NDT inspectionNDT inspection
WPSWPS
Additional information, Additional information, the reference document the reference document
is included in the boxis included in the box
Welding to be carried out Welding to be carried out all round component all round component
(peripheral weld)(peripheral weld)
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553Complimentary SymbolsComplimentary Symbols
NDTNDT
Numerical Values for Welding Processes:Numerical Values for Welding Processes:
111:111: MMA welding with covered electrodeMMA welding with covered electrode
121:121: Sub-arc welding with wire electrodeSub-arc welding with wire electrode
131: 131: MIG welding with inert gas shieldMIG welding with inert gas shield
135:135: MAG welding with non-inert gas shieldMAG welding with non-inert gas shield
136:136: Flux core arc weldingFlux core arc welding
141:141: TIG weldingTIG welding
311:311: Oxy-acetylene weldingOxy-acetylene welding
72:72: Electro-slag weldingElectro-slag welding
15: 15: Plasma arc weldingPlasma arc welding
ISO 2553 / BS EN 22553ISO 2553 / BS EN 22553
AWS A2.4 Welding SymbolsAWS A2.4 Welding Symbols
11(1-1/8)(1-1/8)
6060oo
1/81/8
Depth of Depth of BevelBevel
Effective Effective Throat Throat
Root OpeningRoot Opening
Groove AngleGroove Angle
AWS Welding SymbolsAWS Welding Symbols
11(1-1/8)(1-1/8)
6060oo
1/81/8
GSFCAWGSFCAW
Welding Process Welding Process
GMAWGMAW
GTAWGTAW
SAWSAW
AWS Welding SymbolsAWS Welding Symbols
3 3 – – 1010
3 – 103 – 10
Welds to be Welds to be staggeredstaggered
SMAWSMAW
ProcessProcess
1010
33 33
AWS Welding SymbolsAWS Welding Symbols
1(1-1/8)
60o
1/8
FCAW
Sequence of Operations
1st Operation
2nd Operation
3rd Operation
AWS Welding SymbolsAWS Welding Symbols
1(1-1/8)
60o
1/8
FCAW
Sequence of Operations
RT
MT
MT
AWS Welding SymbolsAWS Welding Symbols
Dimensions- Leg Length
6/86 leg on member A
8
6Member A
Member B
AWS Welding SymbolsAWS Welding Symbols